Things that worked for me:
Dev mode was turned on and iP restarted
What herbertv mentioned about resetting Privacy Settings (#786373022)
Re-opening Xcode AFTER this was done (I forgot to close it before doing the above and it didn't work, then closed it, re-opened it and it showed up)
AND: ensuring the iP, watch and mac were all on the same network. In my case, on the watch only my 2.4Gh Wifi showed up, switching to that network on my iP and mac did the trick.
MCbizzle
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